Synthesis and Characterization of Aluminum and Gallium Complexes of Heterocyclic Carboxaldehyde Thiosemicarbazones. Single-Crystal Structure of [(MeAl){NC₄H₃CHNNC(S)NⁱC₃H₇}(AlMe₂)]₂and (GaMe₂)₂[SC₄H₃CHNNC(S)NPh]

Abstract

Novel tetranuclear metal complexes with the formula [(MeM){NC4H3CHNNC(S)NR}(MMe2 )]2 (M = Al, R = i C3H7 (1); M = Ga, R = i C3H7 (2); M = Al, R = Me (3); M = Ga, R = Me (4)) result when pyrrolecarboxaldehyde thiosemicarbazone ligands are mixed with trimethylaluminum and -gallium. Four dinuclear metal compounds with the formula (MMe2)2[SC4H3CHNNC(S)NR] (M = Al, R = i C3H7 (5); M = Ga, R = i C3H7 (6); M = Al, R = C6H5 (7); M = Ga, R = C6H5 (8)) were synthesized by the methane elimination reaction of thiophenecarboxaldehyde thiosemicarbazones with trimethylaluminum and -gallium. The X-ray crystal structures of 1 and 8 are described. The structural data revealed that 1 is a tetranuclear aluminum compound with an eight-membered ring system and 8 is a dinuclear gallium compound with a weak interaction between the pendant thiophene and the gallium center.

Bonding and structure trends of thiosemicarbazone derivatives of metals—An overview

“…Organometallic thiosemicarbazone complexes of Al and Ga have been prepared by reacting a trialkyl metal salt, R 3 M (M = Al, Ga), with a thiosemicarbazone ligand in toluene [124][125][126]. Indium(III) complexes were generally prepared using indium(III) halide/nitrate [127], while thallium(III) complexes were prepared using R 2 Tl(OH) [R = CH 3 , phenyl] [25,128,129].…”

“…In complexes 117-126, the -N 2 H, group deprotonates and the ligands bind via N 4 , N 3 , S-donor atoms, and in complexes 127-132, the of OH group deprotonates, and ligands bind via O, N 3 , S-donor atoms. The geometry is square planar with the fourth site occupied by Cl, Br, NCS (N-bonding), MeCO 2 (117)(118)(119)(120)(121)(122)(123)(124)(125)(126), or by PPh 3 or NH 3 (127)(128)(129)(130)(131)(132). The ligand is uninegative tridentate (P, N 3 , S-donor atoms) in complex [Ni(L)Y] NO 3 133 [204].…”

Structural and spectral studies of a new copper(II) complex with a tridentate thiosemicarbazone ligand

“…Considerable interest in Schiff base compounds containing thiosemicarbazones and their transition metal complexes has also grown in the areas of biology and chemistry due to biological activities [4][5][6], such as antitumoral [7][8][9][10][11], fungicidal [12,13], bactericidal [14], or antiviral [3], and nonlinear optical properties [15,16]. They have been used for metal analyses [17], for device applications related to telecommunications, optical computing, storage, and information processing [18].…”

Spectroscopic, thermal and electrochemical characterization of synthesized divalent transition metal complexes with cysteine and 4-substituted thiosemicarbazides

“…The activity of these compounds [22,23] is due to their ability to form stable complexes with the essential metal ions. The chemistry of substituted thiosemicarbazides and their metal complexes has been a focus over the last three decades because thione compounds can act as anticarcinogenic or antitumour reagents [24][25][26][27]. Recently, numerous complexes of thiosemicarbazide derivatives have been prepared and characterized [28][29][30][31][32][33][34][35][36].…”